This is my interpretation as well.I always assumed that as soon as Bond found out Dimitrios was leaving, he was out of there. He was all business with Solange even when pretending to be interested in her. So I'm thinking he didn't waste time with her beyond that point. He ordered room service to make it sound to her like he was staying (and maybe as a consolation prize for her), but then dashed off to the airport to chase after her husband. Solange's first realization that Bond wasn't there may well have come when room service delivered his order.
Yes, this was my take on the scene.